Ground work, aka, laying the foundations, is the process of developing an early stage relationship between two attracted persons in order to pursue a person for sexual activities and/or a relationship
person a; "So whats happening with you and rebecca?
Person b; "Not much at the moment, I've been laying down some good ground work, so hopefully it'll (sex) happen soon
person a; "What do you mean?"
person b; "Sent her a few cheeky texts and I speak to her on facebook alot"